My favourite strategy is to observe the Soviet base, specifically the War Factory, from a safe distance within my chronoshift zone. I do this in the hopes that the enemy will purchase a Demo Truck. If they do I will chronoshift into their base and destroy the trucks. If there are any defences I will try and shift to a blind spot.
I was able to do this a couple of weeks ago on KOTG. The enemy was planning a demo rush and purchased two Demo Trucks. As they were leaving I shifted to the front of the War Factory so the Tesla Coil could not zap me and shot the first truck, which when detonated also detonated the first truck. It was hilarious and definitely a highlight of my recent game experience.
It's also useful to get to know the usual sneak routes players will take with their Demo Trucks so you can better intercept them.